Psalm 112:10The wicked man will see and be grieved; he will gnash his teeth and waste away; the desires of the wicked will perish.

Matthew 8:12But the sons of the kingdom will be cast into the outer darkness, where there will be weeping and gnashing of teeth."

Matthew 22:13Then the king told the servants, 'Tie him hand and foot and throw him outside into the outer darkness, where there will be weeping and gnashing of teeth.'

Luke 13:28There will be weeping and gnashing of teeth when you see Abraham, Isaac, Jacob, and all the prophets in the kingdom of God, but you yourselves are thrown out.

Treasury of Scripture

And cast you the unprofitable servant into outer darkness: there shall be weeping and gnashing of teeth.

cast.

Matthew 3:10 And now also the axe is laid unto the root of the trees: therefore every tree which bringeth not forth good fruit is hewn down, and cast into the fire.

Matthew 5:13 Ye are the salt of the earth: but if the salt have lost his savour, wherewith shall it be salted? it is thenceforth good for nothing, but to be cast out, and to be trodden under foot of men.

Jeremiah 15:1,2 Then said the LORD unto me, Though Moses and Samuel stood before me, yet my mind could not be toward this people: cast them out of my sight, and let them go forth…

outer.

Matthew 8:12 But the children of the kingdom shall be cast out into outer darkness: there shall be weeping and gnashing of teeth.

Matthew 13:42,50 And shall cast them into a furnace of fire: there shall be wailing and gnashing of teeth…

Matthew 22:13 Then said the king to the servants, Bind him hand and foot, and take him away, and cast him into outer darkness; there shall be weeping and gnashing of teeth.

(30) Cast ye the unprofitable servant . . .--We have had so far the special punishment of sloth, but it is not complete without the solemn and emphatic recurrence of the "darkness" and "gnashing of teeth."

Verse 30. - Cast ye the unprofitable servant into [the] outer darkness (Matthew 8:12). The parable merges into the real. The 'matter represented bursts through the veil under which it was delivered, and stands forth plainly and awfully. The command is issued to the ministers of the Lord's vengeance, whether earthly or angelic. The slave was truly unprofitable, as he advanced neither his master's interests nor his own, which were bound up with the other. While the faithful servants enter into the joy of the Lord, he is rejected from his presence, expelled from the kingdom of heaven, banished we know not whither. And why? Not for great ill doing, sacrilege, crime, offence against the common laws of God and man; but for neglect, idleness, omission of duty. This is a very fearful thought. Men endeavour to screen themselves from blame by minimizing their talents, ability, opportunities; this parable unveils the flimsiness of this pretence, shows that all have responsibilities, and are answerable for the use they make of the graces and faculties, be they never so small, which they possess. Spiritual indolence is as serious a sin as active wickedness, and meets with similar punishment, Our Lord's account of the last judgment terribly confirms this truth (vers. 42-45). There shallbe [the] weeping and [the] gnashing of teeth (Matthew 24:51). "There," viz. in the outer darkness. The remembrance of lost opportunities, wasted graces, bartered privileges, will fill the mind of the banished with terrible remorse, and make existence a very hell; and what more shall be added? Some of the Fathers have recorded a gnomic saying derived from this parable, if not an utterance of our Lord himself, "Be ye approved bankers."

25:14-30 Christ keeps no servants to be idle: they have received their all from him, and have nothing they can call their own but sin. Our receiving from Christ is in order to our working for him. The manifestation of the Spirit is given to every man to profit withal. The day of account comes at last. We must all be reckoned with as to what good we have got to our own souls, and have done to others, by the advantages we have enjoyed. It is not meant that the improving of natural powers can entitle a man to Divine grace. It is the real Christian's liberty and privilege to be employed as his Redeemer's servant, in promoting his glory, and the good of his people: the love of Christ constrains him to live no longer to himself, but to Him that died for him, and rose again. Those who think it impossible to please God, and in vain to serve him, will do nothing to purpose in religion. They complain that He requires of them more than they are capable of, and punishes them for what they cannot help. Whatever they may pretend, the fact is, they dislike the character and work of the Lord. The slothful servant is sentenced to be deprived of his talent. This may be applied to the blessings of this life; but rather to the means of grace. Those who know not the day of their visitation, shall have the things that belong to their peace hid from their eyes. His doom is, to be cast into outer darkness. It is a usual way of expressing the miseries of the damned in hell. Here, as in what was said to the faithful servants, our Saviour goes out of the parable into the thing intended by it, and this serves as a key to the whole. Let us not envy sinners, or covet any of their perishing possessions.